Answer:
[tex]1.a + 3b = 3 + 3( - 2) \\ = 3 + ( -6) \\ - 3[/tex]
[tex]2. \frac{x + y}{a} = ( - 1) + ( - 4) \div 3 \\ = 3 \div 3 \\ = 1[/tex]
[tex]3.2(x - y)^{2} = 2( - 1 + 4) \div 3 \\ = 2(3) ^{2} \\ = 12[/tex]
[tex]4.5a - 3b + 4 = 5(3) - 3( - 2) + 4 \\ = 15 - \: - 6 \: + 4 \\ = 25[/tex]
[tex]5. \frac{2(x ^{2} - y2) }{ab} = 2( - 1 {}^{2} - 4 {}^{2} ) \div 3( - 2) \\ = 2( - 2 - \: - 8) \div - 6 \\ = 2( - 1) \\ = - 2[/tex]
[tex]6.a x + 2x - 7x \\ = 4x[/tex]
[tex]7.(13x + 12y) + (8x \: - 5y) \\ = 21x + 17y[/tex]
[tex]8.(6x - 9y) - (11x - 2y) \\ = - 5x - 7y[/tex]
[tex]9.(4x2 {}^{2} + 5x + 9) \\ + (4x {}^{2} + x - 9) \\ = 8x {}^{2} + 6x + 18[/tex]
[tex]10.(15x {}^{2} + 6x - 14y {}^{2} ) - (15x {}^{2} + 6x - 14y2) \\ = x {}^{2} + x - y {}^{2} [/tex]
If there is no possible number for the letter, it is considered as 1. :)
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