3x-8+5x+39+4x+51 = x(3+5+4) + -8 + 39 + 51 = 12x +82
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By including its plus or minus signs
90-39 = 51 degrees
51
2 goes into 102 51 times. (102 divided by 2 equals 51)
5x+3y = 51 y = 10x-8 Substituting the bottom equation into the top equation: 5x+3(10x-8) = 51 5x+30x-24 = 51 5x+30x = 51+24 35x = 75 Divide both sides by 35 to find the value of x: x = 75/35 = 15/7 in its lowest terms. Substitute the value of x into the original equations to find the value of y: So: x = 15/7 and y = 94/7