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Solve this simultaneous equations, clearly showing all of your workings: x^2 + 2y =9, y - x = 3

Equation 1: x 2 + 2y = 9Equation 2: y - x = 3 Rearrange equation 2: y = 3 + x Substitute y = 3 + x into equation 1x 2 + 2(3 + x) = 9x 2 + 6 + 2x = 9x 2 + 2x - 3 = 0(x + 3)(x - 1) = 0so x = 1 and -3 substitut...
EJ
Answered by Ella-May J. • Maths tutor
3075 Views

Why do simple covalent molecules compounds have low melting and boiling points?

Define:A simple covalent compound consists of a small number of non-metal elements covalently bonded together. (1)For example, H2O , CO2, O2. (1)Relate to MP/BP: The small molecules have only weak intermolec...
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Answered by Sam B. • Chemistry tutor
8964 Views

Solve 2y + 17 = 6y + 5

Subtract 2y from both sides:4y = 12Divide by 4:y = 3
SB
Answered by Sam B. • Maths tutor
3880 Views

How do I form the perfect tense of regular verbs in French?

The perfect tense is used for completed actions in the past , for example, 'I played'- ' j'ai joué 'To form the perfect tense, we need a subject (a noun, name, or pronoun - je, tu, il , etc.), an auxiliary (...
OC
Answered by Olivia C. • French tutor
2102 Views

Solve the simultaneous equations, make sure to show clear algebraic working: 3x + 5y = 14, 4x + 3y = 4

3x + 5y = 14 (times this entire equation by 3) --> 9x + 15y = 42 4x + 3y = 4 (times this entire equation by 5) --> 20x + 15y = 20Now both of the simultaneous equations have 15y, so you can subtract the...
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Answered by Alexander T. • Maths tutor
5857 Views